vdagent-x11-randr: Fix building warning
vdagent-x11-randr: Fix building warning

This patch can be safely applied since it just deletes unused variables.

Signed-off-by: Dunrong Huang <0c36fce70fa0cd89087deb8b79831a4cea16f5ca@gmail.com>

elmarco/vdagent-gtk,elmarco/vdagent-gtk,elmarco/vdagent-gtk